大功率宽带高增益平坦度RF功放的设计与实现-微电子学与固体电子学专业论文.docx

Abstract RF power amplifiers are the key components in wireless communication systems and radar systems, the performance of the RF power amplifier is very important for the whole system performance. Broadband RF power amplifier is becoming a popular research interest these years because the application in Electronic warfare systems, Security communication systems, radar systems, High-speed optical fiber communication systems, wideband test measurement and so on. It’s very difficult to gain good flatness and output high-power in the broadband work frequency because the gain of the device falls off at approximately 6dB/octave. In the research, we need design a RF power amplifier which can work from 30MHz to 400MHz. The P1dB output power of the PA is more than 49dBm, and the flatness is less than ±0.5dB in the work frequency, the power added efficiency of the PA is more than 30%. Among these targets, achieving the fine flatness is the greatest difficulty. In this paper, we briefly introduce the research status and the research value of the Broadband RF power amplifier, the application of the broadband RF PA in military security communication, the classification of the RF PA, the foundation of the design theory, and focus on the nonlinearity characteristics of the power amplifier such as AM-AM, AM-PM. After comparing a variety of design scheme, we decide to select the push-pull amplifier structure as the structure of the whole amplifier. Starting from the chosen of the device, we introduce the simulation of the project and the debugging of the PA, and then we show the practical measure result of the amplifier. And then we use Simplified Real Frequency Technique to improve the flatness of the PA to satisfy the target of the project, and show the practical test result. The practical test result show that , in the whole required work frequency, the P1dB output power of the RF power amplifier is more than 49dBm, the power added efficiency is more than 32%, and the